9721408 has 14 divisors (see below), whose sum is σ = 19291046. Its totient is φ = 4860672.

The previous prime is 9721373. The next prime is 9721421. The reversal of 9721408 is 8041279.

It can be written as a sum of positive squares in only one way, i.e., 9684544 + 36864 = 3112^2 + 192^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9721408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75885 + ... + 76012.

Almost surely, 2^9721408 is an apocalyptic number.

It is an amenable number.

9721408 is a deficient number, since it is larger than the sum of its proper divisors (9569638).

9721408 is a wasteful number, since it uses less digits than its factorization.

9721408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151909 (or 151899 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 9721408 is about 3117.9172535524. The cubic root of 9721408 is about 213.4239025163.

The spelling of 9721408 in words is "nine million, seven hundred twenty-one thousand, four hundred eight".